Mayfield Market Towns claim that

it is accepted by West Sussex County Council and the Highways Agency that .. proposals are shown and are agreed for how the development will relate to the A23 and to other major roads in the area. In essence, 4,000 dwellings can be serviced from a grade separated new junction at Albourne and closure of the Sayers Common junction, and Mayfield control the land to implement these two proposals.

[Mayfield Market Towns submission to HDC]